dissapointing movie

Not very creative? How many films do you know of that end that way?

>I don't think two guys who spoke completely different languages would continue to talk to one another for months at a time in long dialogues knowing that the other one couldn't understand a word<

You seem to recognize that the ending was existential, so why not afford the same recognition to the rest of the movie? This was not cinema verite but a metaphorical take on the way, historically up through the present time, NATION-STATES and PEOPLES seem to be talking to each other when in fact they are talking past each other. Instead of communicating, they engage in parallel monologues.

Everything else in your post tells me that you expected to see a real-life situation through a clear glass pane rather than a metaphorical meditation on the causes of, and irrationality of, war.

As I point out in my bio, Great movies are not windows that let us see reality, they're windows that let us peer into the mind of the director and screenwriter.